UPD75P3036 NEC, UPD75P3036 Datasheet - Page 36

• Manufacturer Part Number: UPD75P3036
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

36
Subsystem Clock Oscillation Circuit Characteristics (T
Notes 1.
Caution When using the subsystem clock oscillation circuit, wire the portion enclosed in the dotted line
Crystal
resonator
External
clock
Resonator
2.
in the above figure as follows to prevent adverse influence due to wiring capacitance:
• Keep the wiring length as short as possible.
• Do not cross the wiring with other signal lines.
• Do not route the wiring in the vicinity of a line through which a high alternating current flows.
• Always keep the ground point of the capacitor of the oscillation circuit at the same potential
• Do not ground to a power supply pattern through which a high current flows.
• Do not extract signals from the oscillation circuit.
The subsystem clock oscillation circuit has a low amplification factor to reduce current
dissipation and is more susceptible to noise than the main system clock oscillation circuit.
Therefore, exercise utmost care in wiring the subsystem clock oscillation circuit.
The oscillation frequency shown above indicate characteristics of the oscillation circuit only. For the
instruction execution time, refer to AC Characteristics.
The oscillation stabilization time is the time required for oscillation to be stabilized after V
applied.
as V
C3
DD
Recommended
XT1
XT1
.
Constants
V
XT2
XT2
DD
R
C4
Oscillation frequency
(f
Oscillation
stabilization time
XT1 input frequency
(f
XT1 input high-,
low-level widths
(t
XT
XT
XTH
)
)
Note 1
Note 1
, t
Parameter
XTL
)
Note 2
A
= –40 to +85 C, V
V
DD
= 4.5 to 5.5 V
Conditions
DD
= 1.8 to 5.5 V)
MIN.
32
32
5
32.768
TYP.
1.0
MAX.
100
PD75P3036
35
10
15
DD
2
has been
Unit
kHz
kHz
s
s